JPH1037585A - Door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of cylinder oil and to prevent buffer action from decreasing even if air for preventing expansion that may occur depending on the temperature of operating fluid is not mixed in. SOLUTION: This door closer is designed so that a piston 2 is put into a cylinder 1 in which hydraulic fluid is sealed and packed, so as to partition the inside into a first, high-pressure chamber 11 and a second, low-pressure chamber 12 and equipped with a return spring 3 mounted inside the second chamber 12. In this case, a flexible bag 5 is connected to the outside of the second chamber 12 side of the cylinder 1 in such a way as to hold a liquid-tight state, time inside of the second cylinder 12 is communicated with the inside of the bag 5 through a communicating passage 14, a ball valve 6 is provided in the portion of the cylinder 1 where the communicating passage 14 is located, and only the operating fluid is packed into spaces inside the cylinder 1 and the bag 5 without entrainment of air bubbles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement of a door closer provided on a door.

[0002]

2. Description of the Related Art As a conventional door closer, a cylinder filled with hydraulic oil, a piston for dividing the cylinder into a first chamber in the front and a second chamber in the rear, and first and second chambers through orifices are provided. And a return spring mounted in the second chamber and biasing the piston toward the first chamber;
A rack provided on the piston, a pinion that meshes with the rack, a rotation shaft supported by the cylinder and fixed to the piston and the linking arm, and a first chamber and a second chamber that are juxtaposed with the oil guide path. And a check valve provided in the bypass as a very general one. Such a door closer is disclosed in, for example, Japanese Utility Model Laid-Open No. 2-85780. And are known.

[0003]

However, in the above-described conventional closer, if only the working oil is sealed and filled in the cylinder, the working oil expands due to a rise in temperature, the internal pressure of the cylinder abnormally increases, and the O-ring is mounted. Oil leaks may occur from parts.

In order to absorb the expansion of the hydraulic oil, usually,
Normally, buffer air of 3 to 4% of the working oil amount by volume ratio is sealed in the cylinder. In this case, the expansion of the hydraulic oil due to the temperature rise is absorbed in a form that crushes the bubbles.

However, if the air mixed with the hydraulic oil stays in the orifice portion in the cylinder or the first chamber on the high pressure side, the following various problems occur.

That is, if this air passes through the orifice portion while the door is closed, the inherent buffering action of the door closer utilizing the viscous resistance of the hydraulic oil is impaired, and it is very dangerous that the door will close rapidly. .

Similarly, the so-called back check function of the closer, that is, the brake function when the door is blown by the wind, utilizes the viscous resistance when the hydraulic oil passes through the orifice, but air bubbles pass through the orifice. Obviously, this back-checking function is lost when doing so.

In recent years, there has been proposed a stopper for a closer which stops a door at an arbitrary closing angle position by providing a valve in an oil guide passage and opening and closing the valve from the outside.
In this case, if the bubbles are on the first chamber side, there is a disadvantage that the stop angle shifts by an amount corresponding to the compression of the bubbles.

The door closer according to the present invention eliminates the oil leaking irrespective of the fact that only the working oil is exhausted by exhausting the air put into the cylinder, and also reduces the cushioning effect caused by the presence of the mixed air or the closing of the closer. It has been proposed for the purpose of eliminating the deviation of the stop angle position at the stopper.

[0010]

In order to achieve the above object, a door closer according to the present invention comprises a cylinder filled with hydraulic oil, and a piston for partitioning the cylinder into a front first chamber and a rear second chamber. An oil guide path communicating the first chamber with the second chamber via an orifice, a return spring elastically mounted in the second chamber to bias the piston toward the first chamber, and a rack provided on the piston A pinion that meshes with the rack, a rotation shaft that is supported by the cylinder, and that fixes the piston and the linking arm; and a first chamber and a second chamber that are arranged in parallel with the oil guide path and communicate with each other through the piston. In a door closer comprising a bypass and a check valve provided in the bypass, a flexible bag body is liquid-tightly connected to the outside of the second chamber of the cylinder, and the second chamber and the bag body are communicated through a communication passage. To the cylinder Provided with a ball valve in the communicating passage portion that is characterized in that it is filled only hydraulic oil without mixing air bubbles in the cylinder and the bag body space.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes a cylinder filled with hydraulic oil, 13 denotes a cylinder cap forming a rear bottom portion of the cylinder 1, and 2 denotes a cylinder 1
The piston 3 is inserted into the piston and partitions the cylinder 1 into a front first chamber 11 and a rear second chamber 12.
Is a return spring mounted in the second chamber 12 so as to be urged toward the first chamber 11.

In the cylinder 1, the first chamber 11 on the high pressure side
Although not shown, the space between the pressure chamber and the second chamber 12 on the low pressure side is communicated with an oil guide passage having an orifice interposed therebetween.

The piston 2 is provided with a rack 21 along the sliding direction, and the rack 21 is engaged with a pinion 41.

A rotating shaft 42 that rotates integrally with the pinion 41 is fixed to the pinion 41, and the rotating shaft 42 is supported by the cylinder 1. As is well known, one of the linkage arms (not shown) is attached to the outer end of the rotating shaft 42.

Reference numeral 22 denotes a bypass provided in the piston, which is provided in parallel with the above-described oil guide passage, and communicates between the first chamber 11 and the second chamber 12 of the cylinder 1.

A ball valve (not shown) is provided on a piston head (not shown) of the piston 2. When the door is closed, that is, when the piston 2 moves to the left in FIG. 2 can pressurize the hydraulic oil in the first chamber, and when the door is opened,
When the ball moves to the right, the ball valve opens and the first
The working oil in the room can easily move to the second room.

The door closer having the above-described structure is conventionally known. Hereinafter, the main parts of the present invention will be described.

A communication passage 14 is formed at an appropriate position (rear cap 13 in the illustrated embodiment) of the second chamber 12 on the low pressure side of the cylinder 1, that is, on the rear side. Connects a flexible bag (hereinafter simply referred to as a bag) 5 made of, for example, a rubber elastic material in a liquid-tight manner.

That is, the inside of the bag body 5 and the inside of the second chamber 12 are communicated through the communication passage 14 while maintaining a liquid-tight state. The shape of the bag 5 is not limited to the illustrated bottomed cylindrical shape, but can be formed in any shape.

A ball valve 6 is provided in the communication passage portion 14 of the cylinder 1. The ball valve 6 includes a through hole 64 in a central partition portion, a cylindrical valve body 61 having a valve seat 65, a spherical valve body 62, and a fall prevention pin 63.

A small-diameter inner end of the cylindrical valve body 61 is fixed to the communication passage 14 of the cylinder 1 by screwing or the like, and a flange-shaped mouth portion of the bag body 5 is closely attached to the inside of the large-diameter outer end. For this purpose, a bottomed cylindrical protective cylinder 7 having a vent hole 71 to the atmosphere is fixed by screwing. In the figure, reference numeral 8 denotes an O-ring sandwiched between the valve body 61 and the cylinder 1.

Since the working oil is filled and filled in the bag body 5 in the same manner as in the cylinder 1, the space between the mouth of the bag body 5 and the valve body 61 must be fixed in a liquid-tight manner. As the fixing means, an arbitrary means such as an adhering means, a vulcanizing adhering means or a screwing means can be selected in addition to the sandwiching means by another member (protective cylinder 7) as shown.

In the door closer of the present invention, the air is not positively enclosed in the cylinder 1 and the bag 5, but only the hydraulic oil is enclosed and filled.

In the closer according to the embodiment of the present invention constructed as described above, the door closer is in a non-operating normal state in the state of FIG. 1, and the valve element 62 of the ball valve 6 comes off the valve seat 65 and falls off. It is seated on the prevention pin 63.

In such a normal state, when the temperature rises and the hydraulic oil in the cylinder 1 slightly increases, the excess amount of the capacity of the cylinder 1 is stored in the bag 5 in the flexibility or elasticity of the bag 5. It flows in favor.

Then, when surplus hydraulic oil flows in,
The bag expands like a drum or stretches in the axial direction. Conversely, when the temperature drops, the hydraulic oil in the bag flows into the cylinder 1, and in this case, the bag 5 contracts in a drum shape.

At that time, the hydraulic oil flows into and out of the bag 5 in a quasi-static manner, and the internal pressure in the closed space in the cylinder 1 and the bag 5 is uniform, and there is no pressure difference. Body 6
2 does not sit on the valve seat 65.

On the other hand, when the door closer operates in the door opening direction, in other words, when the piston 2 moves backward, the hydraulic oil in the second chamber is pressurized by the piston 2.

The reason is that, although the opening 22 which forms a part of the bypass is present at the rear end face of the piston, the portion other than the opening 22 pressurizes the hydraulic oil in the second room, as if by a subway. This is because the wind blows when the train enters the platform.

Therefore, a pressure gradient is generated between the second chamber 12 and the bag body 5 and the ball valve 6 is closed. As a result, the pressure increase in the second chamber is transmitted to the internal space of the bag body 5 and is unnecessarily transmitted. It operates like a door closer without bubbles in the bag 5 and the space in the cylinder without inflation.

On the other hand, when a person passes through the door opening and releases his / her hand from the door, the piston 2 moves forward while pressurizing the hydraulic oil in the first chamber by the elastic force of the return spring 3, so that the hydraulic oil in the first chamber is The fluid flows into the second chamber through the oil passage and the orifice.

In other words, the hydraulic oil in the first chamber, which has a higher pressure, flows into the second chamber, which has a higher pressure than the hydraulic oil in the bag body 5.

Therefore, since the ball valve 6 keeps its closed state, the pressure rise in the second chamber is transmitted to the internal space of the bag body 5 and unnecessarily inflated as in the case of opening the door. It operates as if it were a door closer having no air bubbles in the bag 5 and the space in the cylinder.

The present invention is not limited to the illustrated embodiment, but can be implemented with various modifications.

For example, in the illustrated embodiment, rubber is used as the material of the bag 5, but a so-called bellows, that is, a bellows made of thin metal can be used.

[0036]

According to the door closer of the present invention described above, even if the cylinder is not filled with air as a relief in terms of the volume of hydraulic oil, the flexible valve communicates with the second chamber of the cylinder. Since the air bag is provided with a plastic bag, expansion and contraction of the hydraulic oil due to a change in temperature are absorbed by the bag, and no oil leakage occurs.

Also, various inconveniences caused by the presence of air bubbles in the cylinder, such as the loss of the buffering function caused when the air bubbles pass through the orifice, the loss of the back check function, or the use of a valve incorporated in the cylinder to stop the stopper device. Various effects such as a shift in the operating angle position can be completely prevented, and the reliability of the closer can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a main part of an embodiment of a door closer according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 cylinder 11 first chamber 12 second chamber 14 communication passage 2 piston 21 rack 22 bypass 3 return spring 41 pinion 42 rotating shaft 5 bag body 6 ball body

Claims (1)

[Claims] 1. A guide in which a first chamber and a second chamber are communicated via an orifice with a cylinder filled with hydraulic oil, a piston partitioning the cylinder into a front first chamber and a rear second chamber. An oil passage, a return spring resiliently mounted in the second chamber and biasing the piston toward the first chamber, a rack provided on the piston, a pinion meshing with the rack, a piston supported by the cylinder, In a door closer including a rotary shaft to which an arm is fixed, a bypass arranged in parallel with the oil guide path, and communicating the first chamber and the second chamber through a piston, and a check valve provided in the bypass, a door closer includes: A flexible bag is connected to the outside of the second chamber in a liquid-tight manner,
A door closer characterized in that a room and a bag body are communicated with each other through a communication path, a ball valve is provided in a communication path portion of the cylinder, and only the working oil is filled without mixing air bubbles into the cylinder and the bag body space.